JaMychal Green is clearly the most attractive name among players not in Spurs pipeline. If he plays well, he could get a training camp invite with a true chance to stick given how Spurs roster is build.
This summer league will be crucial for Joseph and Denmon. Spurs could end up with 8 "good" guards on their roster for the start of the training camp (Parker, Ginobili, Green, Neal, Mills, De Colo, Joseph and Denmon). They are in tough spot and will need to show something in this summer league.
I'm surprised that James Anderson is on the roster. His agent wanted a trade sooner this year and his wish hasn't been granted. It seems that there isn't some kind of bad blood after that event. On the other hand, JA has had a great at ude last year despite being in the doghouse. Maybe this SL is a reward with Spurs guarantying him a lot of playing time to showcase him for other teams. Or maybe JA is still in Spurs plan.